I0 (au) S(v=20) (au)
Al 4.851 1.145
Al1+ 6.366 0.956
Al2+ 8.283 0.784
Al3+ 11.407 0.612
Al4+ 12.881 0.516
Al5+ 14.630 0.427
Al6+ 16.746 0.343
Al7+ 19.709 0.264
Al8+ 24.063 0.189
Al9+ 31.865 0.116
Al10+ 45.507 0.053
Al11+ 88.452 *
Al12+ 92.726 *
Table 1: Mean Excitation Energies and Stopping Cross Sections for v = 20a.u. Protons colliding with Aluminum Ions.